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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Oct-28-2018, 06:52:57 PM   #1
ebg338
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Default Engine noise - need experienced opinions

Could use some help. Have a 2004 M3. Approximately 100,000 miles, smg. Starting having a noise from the engine and figured it was likely vanos related to decided to do all the bullet proofing...

Did the Beisan disk, seals, upgraded cam bolts, basically everything. Went fine. Also did a valve adjustment as it was due. Went fine as well, had 7 out of spec but nothing major. Timing chain guide was broken in the usual place - replaced that as well w/ Beisan. Used the proper timing tool, etc.

Unfortunately the sound is still there and is the same as before the bullet proofing / valve adjustment. No engine light associated with it. Car is not in limp mode. Ran the car briefly with the belts off trying to isolate it and it was still there. (had hoped a pulley, alternator, etc.) At a loss at this point. Attached link is to a Youtube video of the sound. In the video the sound is occurring from the start then stops at 10 seconds then quickly starts again, stops again briefly at 20 seconds, stops again at 27 seconds then starts again after about 10 seconds. The belts are on in this example but the sound is the same with both belts off.


Suggestions would be appreciated. I'm not driving the car.

Thanks
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Old Sun, Oct-28-2018, 07:09:25 PM   #2
eacmen
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Default Re: Engine noise - need experienced opinions

I was trying to track down an intermittent sound as well. Turned out to be heat shield. When you hear the sound put a screwdriver on the heat shield above the headers and see if it goes away.

Is this just at cold start? Just at idle?

Did you do vanos test with DIS after putting it back together?


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Old Sun, Oct-28-2018, 07:15:45 PM   #3
///M3 MD
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Default Engine noise - need experienced opinions

Unfortunately I'm not quite sure where the sound is coming from, but the oil looked OK? Whats the status of the rod bearings? If it was done recently how did oil pump look? It sounds like a bearing gone bad or something vibrating. Does your clutch fan look OK with no movement/play?


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Old Sun, Oct-28-2018, 07:16:06 PM   #4
ebg338
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Default Re: Engine noise - need experienced opinions

Thanks for the response, never occurred to me to check the heat shield. Occurs both at cold start and idle. Didn't do the vanos test after putting it together.
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Old Sun, Oct-28-2018, 07:23:03 PM   #5
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Default Re: Engine noise - need experienced opinions

Definitely not the fan clutch, had that off when running it and sound was there. Oil looked fine. Nothing done with the rod bearings in my ownership or prior owner. All recalls on the car are up to date. My understanding is rod bearing failure sounds like more of a knock / hammer. This isn't that sound but guess anything is possible. Would the oil pump going potentially make this sound?
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Old Sun, Oct-28-2018, 07:25:32 PM   #6
ebg338
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Default Re: Engine noise - need experienced opinions

Also, if a rod bearing would the sound periodically stop?
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Old Sun, Oct-28-2018, 08:17:45 PM   #7
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Default Re: Engine noise - need experienced opinions

Quote:
Originally Posted by ebg338 View Post
Definitely not the fan clutch, had that off when running it and sound was there. Oil looked fine. Nothing done with the rod bearings in my ownership or prior owner. All recalls on the car are up to date. My understanding is rod bearing failure sounds like more of a knock / hammer. This isn't that sound but guess anything is possible. Would the oil pump going potentially make this sound?


Reason I asked about rod bearings was mainly to see if you had visually inspected the bottom end to ensure everything is sound. The bearings going bad cause a knock as you said, nothing like this. I don't think the oil pump would make a sound either and you'd probably have oil pressure lights going crazy if it were the source of the sound.


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Old Sun, Oct-28-2018, 08:20:33 PM   #8
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Default Re: Engine noise - need experienced opinions

Does it go away when engine is revved up and held at constant speed, but above idle? Does it also happen when car is warm or only on cold start?

Were both belts off and the sound stayed, or just the accessory belt was off? Because it also sounds like maybe ac compressor.

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Happy to help with VANOS or any other DIY job around NorCal
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Old Sun, Oct-28-2018, 08:26:20 PM   #9
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Default Re: Engine noise - need experienced opinions

Have u listened in the gearbox area? Press the clutch and see if the sound is still there. Maybe just a heat shield vibrating hopefully.
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Old Sun, Oct-28-2018, 08:53:12 PM   #10
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Default Re: Engine noise - need experienced opinions

Never heard that one before..sounds like something rubbing and grinding
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Discussing Torque Spec thread in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)